/*
 * Copyright (c) 2013, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-web-praise nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.sri.ai.lpitools.gwtgui.client.components.manager;

import java.util.ArrayList;
import java.util.List;

import com.google.gwt.json.client.JSONObject;
import com.sri.ai.lpitools.gwtgui.client.event.SRIServerGeneratedMessageEvent;

import de.novanic.eventservice.client.event.Event;
import de.novanic.eventservice.client.event.RemoteEventService;
import de.novanic.eventservice.client.event.RemoteEventServiceFactory;
import de.novanic.eventservice.client.event.listener.RemoteEventListener;

/**
 * Distributor class for ExecutionEngine callbacks
 * @author bellwein
 */
public class ExecutionEngineDistributor {

	private List<ExecutionEngineListener> listeners;
	
	public ExecutionEngineDistributor() {
		this.listeners = new ArrayList<ExecutionEngineListener>();
				
		// Create a remote Event Service
		RemoteEventService theRemoteEventService = RemoteEventServiceFactory.getInstance().getRemoteEventService();

		// add listener for SERVER_MESSAGE_PROCESS
		theRemoteEventService.addListener(SRIServerGeneratedMessageEvent.SERVER_MESSAGE_PROCESS, new RemoteEventListener() {
			public void apply(Event anEvent) {
				if (anEvent instanceof SRIServerGeneratedMessageEvent) {
					SRIServerGeneratedMessageEvent theEvent = (SRIServerGeneratedMessageEvent) anEvent;
					String message = theEvent.getMessage();
					notifyListenersMessageReceived(message);
				}
			}
		});

		theRemoteEventService.addListener(SRIServerGeneratedMessageEvent.SERVER_MESSAGE_CLIENTID, new RemoteEventListener() {
			public void apply(Event anEvent) {
				if (anEvent instanceof SRIServerGeneratedMessageEvent) {
					SRIServerGeneratedMessageEvent theEvent = (SRIServerGeneratedMessageEvent) anEvent;
					String id = theEvent.getClientID();
					notifyListenersClientIDReceived(id);
				}
			}
		});
		
	}
	
	public void addListener(ExecutionEngineListener listener) {
		this.listeners.add(listener);
	}
	
	public void removeListener(ExecutionEngineListener listener) {
		this.listeners.remove(listener);
	}
	
	public void notifyListenersResultReceived(JSONObject result) {
		for (ExecutionEngineListener listener : listeners) {
			listener.resultReceived(result);
		}
	}
	
	public void notifyListenersTexLiveReceived(String result) {
		for (ExecutionEngineListener listener : listeners) {
			listener.imageTexLiveReceived(result);
		}
	}	
		
	protected void notifyListenersClientIDReceived(String id) {
		for (ExecutionEngineListener listener : listeners) {
			listener.clientIDReceived(id);
		}
	}
	
	protected void notifyListenersMessageReceived(String message) {
		for (ExecutionEngineListener listener : listeners) {
			listener.messageReceived(message);
		}
	}
	
}
